# Wrapped Entities

Explains why every REST API request and response body wraps its resource data under a singular or plural root key field name.

All resources represented in the REST API are *wrapped* with a root key in API requests and responses. This root key is either the *singular* name of the resource and has an [object](/developer/types#object) value, or it's the *pluralized* name of a collection of resources and has an [array](/developer/types#array).

When submitting a request body to a [create](/developer/endpoints#post-resources-create) or an [update](/developer/endpoints#put-resourcesid-update-single) endpoint, the data you're providing about the resource needs to be wrapped in this same manner. Responses to any type of [endpoint](/developer/endpoints) will reflect it as well.